O-ring sealed and nitrogen purged, the Bushnell H2O binos are one hundred pc watertight. They also aspect a sturdy design and style that makes them great for rugged outside use. The housing is roofed in a non-slip rubber armor that helps protect the delicate optics inside from bumps and drops. http://daltonngwlz.getblogs.net/24818340/an-unbiased-view-of-compact-binoculars